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Before this cl if you wanted a callback to trigger when any of a list of
events happened, you'd have to add multiple interactions. Supporting
multiple events allows for a more compact proto with less duplication
in those cases.

Bug: b/168195199
Change-Id: I5614fc741ab83801a1102e1e4c2b99a4add04e86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435639
Commit-Queue: Luca Hunkeler <hluca@google.com>
Reviewed-by: Marian Fechete <marianfe@google.com>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#811954}